Hydrological Effects of Forest Litters and Soil in the Slope of North Mountain of Hebei Province

A preliminary study of hydrological effects of litters layer and soil layer was carried out in six kinds of natural forest stands in the slope of north mountain of Hebei province.The result showed that:(1)The litter total storage capacity and the maximum water holding capacity showed this order: Larix principic-rupprechtii-B.platyphylla-B.davuricaB.platyphylla-Larix principic-rupprechtiiB.platyphylla-B.davurica-Larix principic-rupprechtiiQuercus mongolica-B.davuricaPopulus davidian-B.davurica-Quercus mongolicaB.platyphylla-B.davurica,the litter total storage capacity was about 10.15~30.47 t/hm2,the maximum water holding capacity ranged from 24.33 t/hm2 to 63.57 t/hm2.The modified interception amount of Larix principic-rupprechtii-B.platyphylla-B.davurica was the strongest to 48.60 t/hm2,Populus davidian-B.davurica-Quercus mongolica was the worst to 16.47 t/hm2.(2)Water holding capacity and soaking time of without decomposition litter and semi-decomposition litter both had visible logarithmic relationship,the relationship of absorption rate and immersion time was power function.(3)The average of soil bulk density ranged from 0.89 g/cm3 to 1.18 g/cm3,total soil porosity was about 49.93%~63.08%.With the deepening of the soil thickness,soil bulk density was increased,but total soil porosity was decreased,which pointed that the surface soil was loose.(4)The soil water-holding capacity of Populus davidian-B.davurica-Quercus mongolica was the most powerful to 65.43 t/hm2,and Larix principic-rupprechtii-B.platyphylla-B.davurica was the worst to 37.92 t/hm2,using power function of infiltration rate and infiltration fitting time,the correlation coefficient was above 0.95.